单元测试失败

Question

我有一项在DB中添加城市的服务。它运作良好，现在我需要测试。我以前从未进行过测试。感谢您的建议。我会测试用例-如果它不为null-测试通过（我的意思是如果用户插入任何内容-测试通过，如果他不插入数据-测试失败）。我只需要检查townName为null或no。这是我的TestClass

   [TestClass]
    public partial class TownRepositoryTests
    {
        [TestMethod]
        public async Task InsertTownName_ReturnTownName()
        {
            var builder = new RepositoryBuilder<TownRepository>().SetupManager();

            using (builder.CreateIsolationScope())
            {
               var expectedTown = await TestBuilder.SetupTownNameAsync(builder);

                var repository = builder.Build();

                var townName = expectedTown.Name;

                var result = await repository.InsertTown(townName);

                Assert.IsNotNull(result);
            }
        }
    }

SetupTownNameAsync方法（在这里我添加数据）。我认为它很好用，因为当我使用调试测试时，我检查了此方法是否返回（id = 1，name =“ TestTown”）

       public static class TestBuilder
       {
           public static async Task<Town> SetupTownNameAsync(RepositoryBuilder<TownRepository> builder)
           {
               var town = await builder.CreateTownAsync(name: "TestTown");

               var setupResult = new Town
               {
                   Id = town.Id,
                   Name = town.Name 
               };

               return setupResult;
           }
       }

这是我的InsertTown方法

        public async Task<int> InsertTown(string townName)
        {
            var parameters = new { townName };

            return await Connection.QueryFirstOrDefaultAsync<int>(Adhoc["AddTown"], parameters, Transaction);
        }

当我检查调试测试问题时-此行返回“ TestTown”，但是当我在断言中检查时-我的测试失败

                var result = await repository.InsertTown(townName);

                Assert.IsNotNull(result);